Repeat Mode Operation Description - Renesas 7700 FAMILY User Manual

A-D CONVERTER
8.7 Repeat mode

8.7.2 Repeat mode operation description

(1) When an internal trigger is selected
The A-D converter starts operation when the A-D conversion start bit is set to "1."
The first A-D conversion is completed after 49 cycles of φ
in the 10-bit mode. Then, the contents of the successive approximation register (conversion result)
are transferred to the A-D register i.
The A-D converter repeats operation until the A-D conversion start bit is cleared to "0" by software.
The conversion result is transferred to the A-D register i each time the conversion is completed.
(2) When an external trigger is selected
The A-D converter starts operation when the input level to the
while the A-D conversion start bit is "1."
The first A-D conversion is completed after 49 cycles of φ
in the 10-bit mode. Then, the contents of the successive approximation register (conversion result)
are transferred to the A-D register i.
The A-D converter repeats operation until the A-D conversion start bit is cleared to "0" by software.
The conversion result is transferred to the A-D register i each time the conversion is completed.
When the comparator function is selected, the comparison result is stored in the AN
result bit each time the comparison is completed.
When the level of the
is cancelled and is restarted from step
Figure 8.7.2 shows the conversion operation in the repeat mode.
Fig. 8.7.2 Conversion operation in repeat mode
8–22
______
pin changes from "H" to "L" during operation, the operation at that point
AD
TRG
Trigger occur
Convert input voltage from
AN pin
i
7751 Group User's Manual
in the 8-bit mode, or 59 cycles of φ
AD
______
AD
in the 8-bit mode, or 59 cycles of φ
AD
.
Conversion result
A-D register i
pin changes from "H" to "L"
TRG
pin comparator
i
AD
AD